Comments

With this patch we can now XFAIL tests that are expected to fail at
runtime. This is how it's used:
/* { dg-final { memmodel-gdb-test { xfail x86*-*-* } } } */
Note, that the test will still run.
This is needed for an upcoming known-to-fail test Andrew will contribute
shortly.
Committed to branch.
* lib/gcc-memmodel-gdb-test.exp (memmmodel-gdb-test): Handle
# A cleaner solution would require a new DejaGnu release.